Our basement bathroom (which is used daily by our 3 teenaged boys) is 7' wide with the shower at the end. We did exactly that, just put in a stationary glass panel with no door. Ours is not curbless, we didn't want to dig down for it, but the only time a little bit of water might escape is when they use the handheld sprayer to hose down the glass and floor when they are cleaning their bathroom. But using the rain head shower head that is closer to the wall that is near the drain doesn't let any water escape.
We got the pitch of the shower pretty good... could've been a little more pitched, but screwed up a bit when we installed our own flat pebble shower floor and some water still likes to pool in some spots where the grout got too low. So, we have to regularly spray bleach there because it doesn't like to dry out completely in those spots. So yeah, I suggest paying close attention to that. ;)

(we have a small dip in our 5x8 shower, we 'foot squeegie' it after the water is turned off and it dries ok without discoloration.)

depending on the placement of your shower head, you should be good without a door. we only have a 36" glass panel, the other 5' of side is open, (this with a rainhead) and no water gets out.

Thanks. Mine will also be a rain head which I think will help.

Also, be sure none of the users is a cold-all-the-time person, because any time I've used an open shower, I've hated every minute of it. The second you turn off the shower, it's just freezing, and no time to dry off before opening the shower door...

Here is a basement accessible shower that we did for an in-law suite. It is 7' long and 42" wide. The glass covers about 45" of the 7'. The homeowner has indicated that some water still escapes during a shower. The shower floor is sloped properly. We have been unable to make it leak just by running the shower heads, so there is something else going on.

@Brickwood Builders, Inc. -- uh, water bouncing off a body goes in many more directions than water just shooting out from a fixture!!

we've found the biggest culpret for water out of the shower is off the elbows while your hands are raised, lathering/rinsing your hair. rotate your body so your elbow isnt pointing toward the opening and you are most of the way home.

a heavy toweling type bath mat takes care of the rest for us.

That is exactly my point acm. Glad you got it! No one can definitively say 36" is a large enough glass panel, or 40" or 48" for that matter. Every person is different and how they operate is different. So you take your chances when you opt for this type design.

Our new shower is 5 1/2 ', the glass wall is 3'....no problems

I would also take into consideration the climate where you are located. In colder climates, sometimes it is nice to have an enclosed shower which keeps the heat within the shower. Here in New England it makes toweling off a more pleasant experience when it's cold outside. Just a thought......good luck with your project!

we have a combination heater and vent in our ceiling above the shower. in winter we run the heater til we're dried off and then toggle it to vent. perfectly warms the bathroom without running the 'regular heat' higher.

In my opinion, a shower door adds a lot of comfort. An enclosed shower keeps the heat within the shower and this is really an advantage when there are two people in the shower together. It is much warmer for the person who is not in the water.